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Germany’s Julia Goerges returns the ball to Denmark’s Caroline Wozniacki during their second round match of the French Open tennis tournament at the Roland Garros stadium, Thursday, May 28, 2015 in Paris. Georges won 6-4, 7-6. (AP Photo/Christophe Ena) more >

PARIS (AP) - For Serena Williams, it was a bad right elbow that led to some shaky serving and a dropped set.

For Novak Djokovic, first it was a balky right hip that needed treatment from a trainer; later came an embarrassing mistake.

For Andy Murray, it was a time warning from the chair umpire and losing a set for the first time in six matches against his opponent.

While nine-time French Open champion Rafael Nadal won in straight sets on a cloudy, windy Thursday, some red dirt got in the machine for three of the other biggest names at Roland Garros. That trio put those moments aside and reached the third round, where more significant challenges could await.

“I know I’m capable of playing great tennis,” the top-seeded Williams said. “Just haven’t seen it yet.”

Calling her performance “not professional,” Williams was sloppy as can be for stretches in a 5-7, 6-3, 6-3 victory over 105th-ranked Anna-Lena Friedsam, a German who had never won a Grand Slam match until this week.

Williams committed 21 unforced errors in the first set alone, 52 in all.

The American was particularly subpar with her serve, which she said she hasn’t been able to work on properly in practice because of an elbow injury that led her to withdraw from a clay-court tournament in Rome this month.

“I’m not using it so much as a weapon,” Williams said about her serve. “So hopefully it will get better.”

She double-faulted eight times and allowed Friedsam to accumulate 15 break points, four of which were converted.

“I know my level is literally 100 times better than I played today,” the 19-time major champion said, rolling her eyes, “so I think I take more solace in the fact I can play better, as opposed to the fact that that’s the best I could play. Then I would be in trouble.”

Next comes 27th-seeded Victoria Azarenka, a former No. 1 player and two-time Australian Open champion.

Even if she is 15-3 against Azarenka, including wins in the 2012 and 2013 U.S. Open finals, Williams acknowledged: “I do know if I play the way I did today, I probably won’t be winning my match. So I’m going to have to step it up a level.”

The top-seeded Djokovic and Murray, seeded No. 3, both will take on talented young Australians for berths in the fourth round. Djokovic faces 19-year-old Thanasi Kokkinakis, while Murray meets 20-year-old Nick Kyrgios. There hadn’t been a teenager in the men’s third round at Roland Garros since 2008, but now there are two: Kokkinakis and Croatia’s Borna Coric, 18.

“All of them - Kyrgios, Kokkinakis and Coric - are showing some great skills and potential to be … top players,” Djokovic said. “But it’s a long way ahead.”

Djokovic proclaimed the pain in his upper right leg “nothing serious, really” after taking a medical timeout late in the second set of his 6-1, 6-4, 6-4 win over Gilles Muller. For a few minutes, things did not look promising for Djokovic - prone on the court, getting massaged by a trainer.

But he eventually moved a step closer to completing a career Grand Slam. There was a gaffe at 4-1 in the third set, though, when Djokovic casually watched a ball by Muller sail long but touch the edge of his racket before hitting the court.

The point went to Muller, who broke there.

“Never, never, ever happened. And it should never happen again,” Djokovic said. “I guess a little bit of lack of concentration. … It was funny to me, because I was 4-1 up, double-break. If it was 2-all, or 2-3 down, I wouldn’t be smiling, for sure.”

Murray had won all 12 previous sets the pair had played against each other. So it appeared to be a big deal when Murray was cited for a time violation by the chair umpire shortly before frittering away the second set.

“I was struggling,” Murray said. “There was pressure building.”

But he dealt with the difficulty, just as Djokovic and Williams did, and moves on to a new test.